The force required for a block to just start its motion is 15 N. If Avinash applied a force of 20 N to the block then what will be the frictional force on the block?

Greater than 15 N

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Equal to 15 N

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Less than 15 N

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Equal to 20 N

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Solution

The correct option is C Less than 15 N
Force of 15 N is required by the block to just start its movement. This means the value of the static friction is 15 N. Now if Avinash applied force of 20 N then the block will move. Here sliding friction will act on the block.
We know that the sliding friction is lesser than the static friction. So, in this case the sliding friction will be less than 15 N.

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